To change Apple ID on iPhone, go to the Apple ID page in Settings and edit your contact info. You should always change your Apple ID if you stop using the email account associated with it. Make sure ...

From the Apple Account screen, tap Sign-In & Security to change your email address, phone number, or password. Here, you can also enable two-factor authentication if it's not already enabled, set up ...

We once had to shed our phone number when we changed wireless providers or moved–sometimes even moving from one part of a town to another. One of the great changes in mobile phones since their ...